README.md in ruby-reports-0.0.3 vs README.md in ruby-reports-0.1.0

@@ -25,17 +25,18 @@
   keys from source data
 - Report has ```query``` method. It defines what object will serve data querying from any source
 - (Optional) Report has ```formatter``` method. It defines what object will serve cell value formatting
 
 Example:
-```ruby
+``` ruby
   class MyNiceReport < Ruby::Reports::CsvReport
     config(
       source: :fetch_data,
       expire_in: 15 * 60,
+      storage: Ruby::Reports::Storages::HASH,
       encoding: Ruby::Reports::CP1251,
-      directory: File.join('/home', 'my_home', 'nice_reports')
+      directory: File.join('home', 'nice_reports')
     )
 
     table do
       column 'ID', :id
       column 'User Name', :username
@@ -46,11 +47,11 @@
     def formatter
       @formatter ||= Formatter.new
     end
 
     def query
-      @query ||= Query.new(self)
+      @query ||= Query.new
     end
 
     class Formatter
       def mail_to_link(email)
         "mailto:#{email}"
@@ -59,11 +60,11 @@
       def date(date)
         Date.parse(date).strftime('%d.%m.%Y')
       end
     end
 
-    class Query < Ruby::Reports::Services::QueryBuilder
+    class Query
       def fetch_data
         [
           {id: 1, username: 'user#1', email: '[e-mail]', last_seen_date: '2015/06/06'},
           {id: 2, username: 'user#2', email: '[e-mail]', last_seen_date: '2015/02/07'},
           {id: 3, username: 'user#3', email: '[e-mail]', last_seen_date: '2015/08/13'}
@@ -79,9 +80,67 @@
   > report.filename
   # => '/home/my_home/nice_reports/asdvdsadvasdv.csv'
   > IO.read(report.filename)
   # => "ID;User Name;Email;Last Seen\r\n1;user#1;mailto:[e-mail];06.06.2015\r\n
   # 2;user#2;mailto:[e-mail];07.02.2015\r\n3;user#3;mailto:[e-mail];13.08.2015\r\n"
+```
+
+### Advanced Usage
+
+Here comes example of creating report with dynamicaly defined columns list:
+
+``` ruby
+
+  class MyDynamicCsvReport < Ruby::Reports::CsvReport
+    config(
+      source: :select_data,
+      storage: Ruby::Reports::Storages::HASH,
+      encoding: 'utf-8',
+      csv_options: {col_sep: ',', row_sep: "\n"},
+      directory: File.join(Dir.home, '.ruby-reports')
+    )
+
+    table do |row|
+      column 'First one', decorate_first(row[:first])
+      column 'Second', "#{row[:second]} - is second"
+      columns_list.each do |col|
+        column col.to_s, col.to_sym
+      end
+    end
+
+    class << self
+      attr_accessor :columns_list
+
+      def decorate_first(element)
+        "decorated: #{element}"
+      end
+    end
+
+    attr_reader :main_param
+    def initialize(param, cols = nil)
+      super
+      self.class.columns_list = cols || [:third]
+      @main_param = param
+    end
+
+    def query
+      @query ||= Query.new(self, config)
+    end
+
+    class Query < ::Ruby::Reports::Services::QueryBuilder
+      def select_data
+        [{:first => :one, :second => report.main_param, :third => 3}]
+      end
+    end
+  end
+
+  > report = MyDynamicCsvReport.build('Main param', [:third, :four])
+  # => #<MyDynamicCsvReport:0x00000002171a68 ...>
+  > report.ready?
+  # => true
+  > IO.read(report.filename)
+  # => "First one,Second,third,four\ndecorated: one,Main param - is second,3,\"\"\n"
+
 ```
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.